INVESTMENTS - Available-for-sale securities reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	$ 281,003		$ 272,051
Unrealized Gains	294		3,433
Unrealized Losses	(33,465)		(4,125)
Securities available-for-sale, at fair value	247,832		271,359
SECURITIES HELD-TO-MATURITY
Amortized cost	8,500		7,500
Unrealized gains			628
Unrealized losses	(158)
Securities held-to-maturity, at fair value	8,342		8,128
Allowance for credit losses	31		0
Total securities
Amortized cost	289,503		279,551
Unrealized gains	294		4,061
Unrealized losses	(33,623)		(4,125)
Total securities, at fair value	256,174		279,487
Allowance for credit losses	(31)
U.S. agency securities
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	21,154		21,155
Unrealized Gains	68		133
Unrealized Losses	(2,672)		(318)
Securities available-for-sale, at fair value	18,550		20,970
Corporate securities
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	9,496		9,495
Unrealized Gains	36		31
Unrealized Losses	(764)		(524)
Securities available-for-sale, at fair value	8,768		9,002
SECURITIES HELD-TO-MATURITY
Amortized cost	8,500		7,500
Unrealized gains			628
Unrealized losses	(158)
Securities held-to-maturity, at fair value	8,342		8,128
Allowance for credit losses	31	$ 72
Municipal bonds
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	148,363		136,377
Unrealized Gains	92		1,577
Unrealized Losses	(21,324)		(2,521)
Securities available-for-sale, at fair value	127,131		135,433
Mortgage-backed securities
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	85,142		88,641
Unrealized Gains	77		1,457
Unrealized Losses	(8,044)		(696)
Securities available-for-sale, at fair value	77,175		89,402
U.S. Small Business Administration securities
SECURITIES AVAILABLE-FOR-SALE
Amortized cost	16,848		16,383
Unrealized Gains	21		235
Unrealized Losses	(661)		(66)
Securities available-for-sale, at fair value	$ 16,208		$ 16,552